Dump-Methoden
  /**
   * Ausgabe Request-Parameter mit Wert im Log
   * @param req HttpServletRequest
   */
  public static void dump( HttpServletRequest req )
  {
    Enumeration en = req.getParameterNames() ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = req.getParameter( s ) ;
      log( "HttpServletRequest-Parameter " + s + " -> " + o ) ;
    }
    en = req.getAttributeNames() ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = req.getAttribute( s ) ;
      log( "HttpServletRequest-Attribute " + s + " -> " + o ) ;
    }
  } // end method dump(HttpServletRequest)

  /**
   * Ausgabe Session-Attribute mit Wert im Log
   * @param session HttpSession
   */
  public static void dump( HttpSession session )
  {
    Enumeration en = session.getAttributeNames() ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = session.getAttribute( s ) ;
      log( "HttpSession-Attribute " + s + " -> " + o ) ;
    }
  } // end method dump(HttpSession)

  /**
   * Ausgabe PageContext-Attribute mit Wert im Log
   * @param req HttpServletRequest
   */
  public static void dump( PageContext pageContext )
  {
    Enumeration en ;
    int scope ;

    scope = 0;
    en = pageContext.getAttributeNamesInScope( scope ) ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = pageContext.getAttribute( s , scope ) ;
      log( "PageContext-Attribute (scope " + scope + ") " + s + " -> " + o ) ;
    }

    scope = PageContext.PAGE_SCOPE;
    en = pageContext.getAttributeNamesInScope( scope ) ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = pageContext.getAttribute( s , scope ) ;
      log( "PageContext-Attribute (scope PAGE_SCOPE " + scope + ") " + s + " -> " + o ) ;
    }

    scope = PageContext.REQUEST_SCOPE;
    en = pageContext.getAttributeNamesInScope( scope ) ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = pageContext.getAttribute( s , scope ) ;
      log( "PageContext-Attribute (scope REQUEST_SCOPE " + scope + ") " + s + " -> " + o ) ;
    }

    scope = PageContext.SESSION_SCOPE;
    en = pageContext.getAttributeNamesInScope( scope ) ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = pageContext.getAttribute( s , scope ) ;
      log( "PageContext-Attribute (scope SESSION_SCOPE " + scope + ") " + s + " -> " + o ) ;
    }

    scope = PageContext.APPLICATION_SCOPE;
    en = pageContext.getAttributeNamesInScope( scope ) ;
    while ( en.hasMoreElements() )
    {
      String s = (String) en.nextElement();
      Object o = pageContext.getAttribute( s , scope ) ;
      log( "PageContext-Attribute (scope APPLICATION_SCOPE " + scope + ") " + s + " -> " + o ) ;
    }
  } // end method dump(PageContext)